Abstract
The noise and circuit impedance of an R-SQUID noise thermometer (i.e., a circuit composed of a Josephson junction shunted by a resistor R) have been extensively studied as a function of the applied rf and dc bias currents. Over the temperature range studied (6.3 mK to 740 mK), the noise and impedance were fit very well by predictions of the Resistively-Shunted Junction (RSJ) model and the R-SQUID was used to successfully define an absolute temperature scale over this range. On the basis of these results, the performance of the noise thermometer is evaluated at lower temperatures, particularly at the fixed points defined by the phase diagram of 3He. It is concluded that the R-SQUID should be capable of defining such temperatures down to 1 mK with an accuracy to approximately 0.1%.
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